On a dreary, rain-soaked evening, quirky vagabond Mr. La Souris stumbles upon a lifeless body. To his bewilderment, the corpse mysteriously disappears from his vehicle, leaving behind only a wallet. As authorities launch an investigation into the missing person, La Souris devises an elaborate scheme to safeguard his unexpected discovery. Caught between a web of intrigue and his own eccentricity, he navigates the challenges of his unusual situation while trying to stay one step ahead of the law.